Is your feature request related to a problem? Please describe.
Slidev out of the box already provide the wonderful two-cols-header layout.

But there are cases, where the vice versa: two-cols-footer would make a lot of sense, for example if you want to use two columns and below you need to place a result or a quote

I think it would be nice to have this layout out of the box.

Describe the solution you'd like
Add a two-cols-footer layout just like the two-cols-header layout, but with a footer instead of the header

Describe alternatives you've considered
I thought about a custom layout, but as I don't think this is a very special requirement, more a typical layout, I'd vote to make it generally available.

Another alternative might be to provide a header-two-cols-footer layout and leave the unneeded regions empty? That might replace the two-cols-header layout then?